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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>课堂作业</title>
</head>

<body>
    <script>


        let m = 354456;
        let second = m % 60;
        let minute = parseInt(second / 60);
        let fen = min % 60;
        let xiaoshi = parseInt(minute / 60)
        console.log('354456秒是:' + xiaoshi + '时' + fen + '分' + second + '秒')

         //课堂作业：3.请把354456秒转成：xx时xx分xx秒
    </script>
</body>

</html>